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Completed

NCT Number: NCT03407651

Study of Coagulation Factor VIIa Variant Marzeptacog Alfa (Activated) in Adult Subjects With Hemophilia A and B

Phase 2, multi-center, open-label study designed to evaluate the PK, bioavailability, PD, efficacy and safety of a daily subcutaneous [SC] treatment regimen with MarzAA for bleeding prophylaxis in 12 adult subjects with hemophilia A or B with an inhibitor and history of frequent spontaneous bleeding episodes.

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Key information

Conditions

Hemophilia A With Inhibitor Hemophilia B With Inhibitor

Age range

18 year and older

Sex eligibility

Male

Study type

Interventional

Phase

Phase 2

Primary location

Hematology Center after Prof. R. Yeolyan, Yerevan, Armenia

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About this study

Multi-center, open-label Phase 2 study to evaluate the PK, bioavailability, PD, efficacy and safety of a daily SC treatment regimen with MarzAA for bleeding prophylaxis in adult subjects with hemophilia A or B with an inhibitor. The study will enroll and dose, both intravenously and subcutaneously, a total of 12 adult male subjects with severe congenital hemophilia A or B with an inhibitor, and history of frequent bleeding episodes during the 6 months prior to enrollment, as per the individual's bleeding and treatment records.

Once a subject is enrolled into the trial, the study will be conducted in three parts (occurring consecutively):

Part 1a (24 hours): Single IV administration of MarzAA; Part 1b (48 hours): Single SC administration of MarzAA; Part 2: Daily SC administration. Dose escalation in Part 2 will occur if breakthrough bleeding occurs. Subjects are treated for 50 days at the final dose level required.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Severe congenital hemophilia A or B with an inhibitor.
  • History of frequent spontaneous bleeding episodes.
  • Male, age 18 or older.
  • Affirmation of informed consent with signature confirmation before any trial-related activities.

Exclusion criteria

  • Receiving prophylaxis treatment.
  • Previous participation in a clinical trial evaluating a modified rFVIIa agent.
  • Known positive antibody to FVII or FVIIa detected by central laboratory at screening.
  • Have a coagulation disorder other than hemophilia A or B.
  • Significant contraindication to participation.

Treatment and study plan

Coagulation Factor VIIa variant

Biological

Single intravenous injection of MarzAA, followed by single subcutaneous injection of MarzAA, followed by daily subcutaneous injection of MarzAA for 50 days at final dose level required.

Primary outcomes

  1. Bleeding Episode Prevention Success

    Time frame: Day 1 of final MarzAA dose level - Day 50

    Annualized bleed rate (ABR; spontaneous and total) during Part 2 when on final MarzAA dose level versus recorded historical ABR. The analysis of the primary endpoint (annualized bleeding rate ABR for spontaneous and traumatic bleeds) of the final dose of MarzAA each subject was treated was based on the 1-sample test compared to a predefined rate assumed for the on-demand therapy. The latter was assumed to be 12 (or 1 bleed per month), which was the minimum ABR for each subject according to inclusion criterion 2 (defined as the H0), with no maximum value. A higher score indicated a worse outcome. ABR is on a scale of 0 to 365, with a lower score reflective of a lower number of bleeding events in a year.

Secondary outcomes

  1. Occurrence of Breakthrough Bleeding

    Time frame: From Day 5 of dose level until occurrence of event

    Occurrence of breakthrough bleeds requiring escalation to higher dose level

  2. Occurrence of Clinical Thrombotic Event

    Time frame: From date of first dose until date of first occurrence of clinical event, assessed up to treatment Day 50

    Occurrence of clinical thrombotic event not attributable to another cause

  3. Coagulation Assessment - Prothrombin Time

    Time frame: From date of pre-dose to 24 hours (Part 1a), pre-dose to 48 hours (Part 1b), and pre-dose to Day 50 (Part 2)

    Change in coagulation parameter (prothrombin time [PT]) from pre-dose. Min-max values are reflective of the highest and lowest values for all measured timepoints.

  4. Coagulation Assessment - Activated Partial Thromboplastin Time

    Time frame: From date of pre-dose to 24 hours (Part 1a), 48 hours (Part 1b), to Day 50/end of study (Part 2)

    Change in coagulation parameter (activated partial thromboplastin time [aPTT]) from pre-dose. Min-max values are reflective of the highest and lowest values for all measured timepoints.

  5. Coagulation Assessment - Fibrinogen

    Time frame: From date of pre-dose to 24 hours (Part 1a), 48 hours (Part 1b), or Day 50 (Part 2).

    Change in coagulation parameter (fibrinogen) from pre-dose. Min-max values are reflective of the highest and lowest values for all measured timepoints.

  6. Number of Events of Antibody Formation

    Time frame: From time of first dose of MarzAA until date of first occurrence of clinical event, assessed up to treatment Day 50

    Occurrence of antibody formation resulting in a decreased endogenous level of coagulation Factor VII (FVII) or Factor VII activated (FVIIa)

  7. Number of Events of an Antibody Response

    Time frame: From time of first dose of MarzAA until date of first occurrence of clinical event, assessed up to treatment Day 50.

    Occurrence of an antibody response to MarzAA and whether it is inhibitory and cross-reactive to wild-type recombinant coagulation FVII (wt-rFVII) or wt-FVIIa.

  8. Thrombogenicity Assessment

    Time frame: From time of pre-dose of MarzAA at Day 1 until date of first occurrence of thrombotic event, assessed up to treatment Day 50.

    Number of participants with clinically significant levels of thrombogenicity markers (D-dimer, Prothrombin fragment 1+2 (F1+2), and thrombin-antithrombin complex [TAT]), based on standard laboratory tests and clinical examination with a specific search for any signs of thrombosis

Sponsors and collaborators

Lead sponsor

Catalyst Biosciences

Industry

Registry information

Official study title

Phase 2 Study to Evaluate the Pharmacokinetics, Efficacy and Safety of a Daily Subcutaneous Treatment Regimen With Marzeptacog Alfa (Activated) for Bleeding Prophylaxis in Adult Subjects With Hemophilia A and B Subjects With an Inhibitor

Important dates

Study start
2017
Primary completion
2019
Study completion
2019
First posted
Jan 23, 2018
Registry last updated
Sep 23, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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